Drill press attachment



Aug. 30, AI ||I WIER DRILL PRESS ATTACHMENT Filed April 9, 1959 inria a.

INVENTOR ARTHUR H.WIER

ATTORNEYS Patented Aug. 30, 1960 .Fine

DRILL PRESS ATTACHlVIENT Arthur H. Wiel', Milwaukee, Wis., assignor to Ciento:- Master Corporation, Milwaukee, Wis., a corporation Filed Apr. 9, 1959, Ser. No. 805,300

2 Claims. (Cl. 77-55) This invention appertains to a drill press attachment and is an improvement over Patent No. 2,426,124, granted August 19, 1947.

One yof the primary objects of my present invention is to provide a drill press attachment for electively holding and centering the work relative to a drill, reamer or the like, and embodying a novel spring thrust resisting means for supporting the guide and work holding head relative to the yoke carried by the drill press quill.

Another salient object of my invention is lto provide novel means for initially adjusting the position of the guide and work holding head on the yoke and relative to the work without changing the tension of the springs utilized for holding the head in clamping engagement with the Work, whereby the work will always be centered and held by the head with the same force irrespective of the adjustment of the head on the yoke.

A further object of my invention is the provision of novel spring retaining sleeves slidably lsupporting thrust rods which carry the work engaging head, the rods being movable in the sleeves against the tension of the springs' upon the engagement of the head With the work, the

sleeves with the springs, rods and head being bodily ad' justable on the drill press quill carried yoke.

A further important object of the invention is the provision of novel means for supporting and locking the sleeves in a selected desired position on the yoke.

A still further object of the invention is the provision of adjustable means on the rods for engaging the sleeves to limit the sliding movement of the head against the tension of the springs relative to the yoke.

A still further'importantobject of the invention is'the provision of novel interchangeable bushings carried by the head for engaging, centering and holding different characters of work.

With these and other objects in View, the invention consists in the novel construction, arrangement and formation of parts, as Will be hereinafter more specifically described and claimed, and illustrated in the accompanying drawing, in which drawing,

Figure l is a side elevational View of my improved attachment showing the same connected with the quill of a drill press, parts of the figure being shown broken away and in section to illustrate structural detail, the View also showing a bell type bushing for engaging vertically disposed work;

Figure 2 is a side elevational view of my attachment showing the same connected with the quill of a drill press;

Figure 3 is a horizontal `sectional View taken on the line 3 3 of Figure l, looking in the direction of the arrows and illustrating the means utilized for locking the supporting sleeves in a selected position on the yoke, and

Figure 4 is a detail fragmentary vertical sectional View through the head of the attachment showing a diierent type of bushing carried by the head for engaging horizontally disposed work.

Referring to the drawing in detail, wherein similar reference charactersV designate corresponding parts throughout the several views, the letter A generally indicates my improved drill press attachment for connection with the quill Q of a drillpress. In View of the fact that the drill press is of a Well known type, the same has not been illustrated in detail, but the same is of the type in which the quill Q Vmoves toward and away from the work. In accordance with standard practice the quill Q rotatably carries the drill spindle 5 having connected therewith a chuck 6 for receiving a drill, reamer, or other desired tool. In Figure 1, I have shown a drill in dotted lines carried by the chuck.

My improved drill press attachment A `comprises a vertically disposed yoke 7, which can be in the nature of a casting. The yoke 7 includes spaced parallel vertically disposed arms 8 and 9 connected at their upper ends by a split collar 10 and this collar is adapted to be firmly clamped to the quill Q.' The lower ends of the arms 8 and 9 are joined by a rigid brace or bridge bar 11. This bar 1'1 has formed therein an enlarged opening 12 through which extends the drill or other tool carried by the chuck 6. The arms S and Stare provided with vertically extending smooth guide bores 13, the purpose of which will later appear and it is to be noted that these bores also open out through the lower ends of the arms. Extending laterally from the outer sides of the arms 8 and 9 are hollow bosses 14, for a purpose, which will be more clearly set forth.

Suspended below the yoke 7 is the work engaging head 15. This head 15 can be in the nature of a iiat bar having formed in the center thereof an opening 16 in axial alignment with the opening 12 in the yoke, The head supports various types of interchangeable bushings for engaging differentkinds of work. `In Figure 1, I have shown a bushing 17 of the belll type and this bushing includes a shank 18 for reception in the opening 16. The shank 1S is provided with an annular groove 19 and the head carries a set. screw 2G for `engagement in the groove to releasably hold the bushing 17 in place. This bushing 'is of a type for engaging, centering and holding a piece of work W placed on a table, bench or the like. As shown, the work Wis disposed in a vertical plane and the bell 17 will center the work and the work can be accurately drilled, rearned or counterbored as the case may be to a desired depth as will also be later more fully described. In Figure4 I have shown a V-type bushing -21 and this bushing also is .provided with a shank 22 for reception within'the opening 16 and the set screw 20 is employed for holding this bushing in place. As the bushing 21 is 0f the V-type the same can straddle the work and hence is very effective in use on work layed in a horizontal plane and this bushing can engage round, polygonal and other types of work. The bushings 17 and 21 are of course, provided with guide drill openings and the drill is guided by such openings into the Work.

The head 15 has secured thereto on each side of the opening 16 smooth, polished guide pins 23 and these pins are slidably received Within the bores 13. The guide pins serve las means for permitting smooth up and down movement of the head relative to the yoke without lateral shifting.

Also rigidly secured to the head 15 adjacent to its opposite ends are upstanding thrust rods 24 and these rods are preferably threaded, for the reception off acljustable stop and lock nuts 25. These nuts limit the movement of the head 15 relative to the yoke, as will later appear. The thrust rods are arranged in parallel relation to one another and to the arms 8 and 9 of the yoke 7.

Slidably and rotatably mounted Within the hollow bosses .---g s -,,3 14 are spring retaining sleeves or housings 26. The sleeves or housings 26 have their opposite ends open and the lower ends of the sleeves are counterbored to provide internal annular stop shoulders -27. The upper -ends of the sleevesor housing have formed thereonoutwardly. ex

tending manipulating handlesY 28-for facilitating the turning of the sleeves or housing in the bosses 14, and these. parts also have formed thereon adjacent to the handles, cam locks 29. These cam Vlocks 29 ,extend partially around the sleeves. The outer sides ofthe of the yoke 7 have formed ythereon rack bars 30 and by rotating the sleeves 26 by means of the handles 28, the cam locks.

29` can be moved into and out of locking engagement with the teeth of the rack bars 3,0. VAs-the sleeves are.

also slidable in the ,bosses 14, the sleeves can be `raised and lowered in the bosses to a'desired position and then locked in such position by the cams 29. i i

The thrust rods 24 extend into and through the sleeves Y26 and these rods have coiled about Vthe same` springs 31. The upperends of the springs terminate in vinwardly extending legs 32 and these legs are fitted in slots 33 formed in the upper ends of the rods 24. The lower convolutions of the springs 31 are coiled on a greater diameter than the convolutions of the main body portions of the springs andthese convolutions of greaterV diameter, now indicated by the reference character 34, seat against wear bushings 35. The wear bushihgs 35 are iitted within the sleeves 26 against the internal shouldrelative to Ithe work. Upon the initial adjustment of the head 15, the same is held in such position by locking the sleeves 26 with the yoke 7. This is accomplished by rotating the sleeves and moving the cams 29 between selected teeth of the rack bars 30. 'Ihe bushings will center and hold the work, and as the quill Q moves downwardly the yoke or frame `7 is carried therewith sliding the sleeves '-26 downward on the rods 24 stretching the prings 31 and thus increasing the tension of the springs on the rods 24 and the head 15. Hence, the head 15 with its bushing tightly clamps and holds the Work. The yoke or frame 7 continues its ydownward movement until the saine strikes the nuts 25 and at this time diurther downward movement of the quill Q is stopped. Thus, the positioning of the nuts 25 determines the depth of the drilling, reaming or counterbon'ng of the work.

From the foregoing, it can be seen that I have provided a novel means for suspending the head from the frame or yoke 7 and that the'position of the head relative to the yoke can be quickly adjusted without changing the tension of the spring suspension of the head.

Changes in details may be made without departing from the spirit or the scope of this invention, but what I claim asnew is:

n means anchoring the upper` ends of the springs to theY l. A drill press attachment for centering and holding work comprising a yoke adapted to be vsecured to the quill of Va drill press for movement therewith, ysaid yoke including spacedY parallel armshaving rack Ahars on lthe outer sides thereof and outwardly extending hollow bosses, sleeves slidably and rotatably mounted Vin said bosses, 'a work engaging head disposed below the yoke, upwardly extending thrust rods rigidly carried by the head and slidable through the sleeves, supporting tension springs disposed within the sleeves and coiled about he rods,

upper ends of the rods, means anchoring the lower ends of the springs to the sleeves, said sleeves having outwardly extending cams, and handles on said sleeves for facilitat ing the turning and sliding movement thereof in the bosses, lthe cams being movable into and out of locking engagement with the teeth of the rack bars whereby the sleeves and the head can be raised and lowered on the arms and held `in a selected desired position.

2. A drill press attachment for centering and holding work comprisingy a yoke adapted to be secured to the quill of a drill press, said yoke including spaced parallel arms, a head disposed below the yoke, a work engaging bushing carried by the head, and ymeans for adjustably suspending the head from the yoke including upwardly extending thrust rods carried by the head, sleeves slidably carried by the arms of the yoke, Vmeans for locking the sleeves in a selected adjusted position on the arms, said rods slidably extending through the sleeves, springs housed within the sleeves coiled about said rods, means anchoring the upper ends of the springs to the rods, and means connecting the` lower ends of the springs with the sleeves, said locking means for the sleeves including rack bars on the arms, and cam locks on the sleeves movable into and out of locking engagement with the teeth rack bars.

. References Cited in the le of this patent UNITED STATES PATENTS 2,454,372 Bineter i- Nov. 23, 194s FOREIGN PATENTS 1,007,649 France Feb. 13, 1952 

